Geopolymer Cement Using Red Mud for Wellbore Stability

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Solution Overview

Problem

Existing cement mixtures used in the oil and gas industry struggle to withstand the extreme temperatures, pressures, and chemical environments encountered in hydrocarbon-bearing formations, and there is a need for well cements that can be recycled and reduce CO2 emissions associated with cement formation.

Innovation Solution

A geopolymer slurry composition is developed using red mud, an alkaline activator, and a SiO2 source material, with a Si/Al ratio of 2 to 6, to create a cement that can withstand down-hole environments and reduce CO2 emissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional cement mixtures are used for well cementing, then the cementing process can be completed, but the cement cannot withstand extreme temperatures, pressures, and chemical environments in hydrocarbon-bearing formations

Engineering Contradiction:

Improvewithstand extreme down-hole conditionsVSAvoidcement mixture preparation

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the chemical composition parameters of the cement by using geopolymer chemistry instead of conventional Portland cement chemistry. Specifically, it controls the Si/Al ratio between 1.5:1 and 3:1 and uses specific alkaline activators (sodium silicate, sodium hydroxide) to achieve a geopolymerization reaction that produces a more chemically resistant and thermally stable binding matrix capable of withstanding extreme down-hole conditions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining red mud (alumina source), silica sand (silica source), and alkaline activators to form a geopolymer cement. This composite approach integrates multiple materials with complementary properties: red mud provides alumina, silica sand provides silica, and the alkaline activators facilitate geopolymerization, resulting in a composite binder with enhanced resistance to temperature, pressure, and chemical environments

Inventive Principle:

Principle #40Composite materials

2Object-generated harmful factors

If conventional cement is used for well cementing, then the cementing function is achieved, but CO2 emissions are generated and industrial waste is not recycled

Engineering Contradiction:

ImproveCO2 emissionsVSAvoidcement production process

Core Design Contradiction:

Object-generated harmful factorsVSEase of manufacture

Solution Approach 1:

The patent converts harmful factors into beneficial outcomes by using red mud, an industrial waste product with high alkalinity and potential environmental hazards, as a primary raw material. The geopolymerization process transforms this waste material into a valuable construction material, simultaneously reducing industrial waste disposal problems and eliminating CO2 emissions associated with conventional cement production

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent recovers and reuses red mud, a discarded industrial byproduct from alumina production, as a valuable raw material for geopolymer cement. This recovery process prevents the waste from being discarded into the environment and instead utilizes it as an alumina source, achieving both waste reduction and sustainable material production

Inventive Principle:

Principle #34Discarding and recovering

3Object-generated harmful factors

If red mud is used as a primary material in geopolymer slurry, then industrial waste is recycled and CO2 emissions are reduced, but the cement mixture complexity increases

Engineering Contradiction:

Improveindustrial waste recyclingVSAvoidgeopolymer slurry composition

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

The patent manages the complexity of using red mud by precisely controlling key chemical parameters, particularly the Si/Al ratio (maintained between 1.5:1 and 3:1) and the alkaline activator composition (sodium silicate to sodium hydroxide ratio). These parameter controls ensure consistent geopolymerization reactions and predictable cement performance, making the process manageable despite the complexity of using industrial waste as a primary material

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The geopolymer slurry effectively cements wellbore locations, providing a sustainable solution by recycling industrial waste and reducing CO2 emissions while maintaining mechanical integrity under extreme conditions.

Implementation Method 1

The alkaline activator may include sodium silicate and sodium hydroxide

Methodology Applied

Scientific EffectDissolution: Solvation

Implementation Method 2

The geopolymer slurry is based on red mud... converting red mud chemically into a geopolymer

Methodology Applied

Scientific EffectPolycondensation: Chemical Bonding

Data Source

PatentUS20260022288A1Development of geopolymer cements utilizing red mud for primary well cementing applications

Publication Date: 2026.01.22 SAUDI ARABIAN OIL CO

AI summary

A composition and method for well cementing are provided. The composition comprises a geopolymer slurry that is prepared by mixing a particulate material comprising ground red mud, an alkaline activator, an aqueous solvent, and a SiO2 source material added to produce a geopolymer slurry with a Si/Al ratio of from 2 to 6. The method for well cementing includes pumping a geopolymer slurry into a location to be cemented and hardening the geopolymer slurry to form a cement.